---
title: notValue
description: Creates a not value validation action.
source: /actions/notValue/notValue.ts
contributors:
  - fabian-hiller
  - lo1tuma
---

import { ApiList, Property } from '~/components';
import { properties } from './properties';

# notValue

Creates a not value validation action.

```ts
const Action = v.notValue<TInput, TRequirement, TMessage>(requirement, message);
```

## Generics

- `TInput` <Property {...properties.TInput} />
- `TRequirement` <Property {...properties.TRequirement} />
- `TMessage` <Property {...properties.TMessage} />

## Parameters

- `requirement` <Property {...properties.requirement} />
- `message` <Property {...properties.message} />

### Explanation

With `notValue` you can validate the value of a string, number, boolean or date. If the input does not match the `requirement`, you can use `message` to customize the error message.

## Returns

- `Action` <Property {...properties.Action} />

## Examples

The following examples show how `notValue` can be used.

### Number schema

Schema to validate a number that is more or less than 100.

```ts
const NumberSchema = v.pipe(
  v.number(),
  v.notValue(100, 'The number must not be 100.')
);
```

### Date schema

Schema to validate a date that is before or after the start of 2000.

```ts
const DateSchema = v.pipe(
  v.date(),
  v.notValue(new Date('2000-01-01'), 'The date must not be the start of 2000.')
);
```

## Related

The following APIs can be combined with `notValue`.

### Schemas

<ApiList
  items={[
    'any',
    'bigint',
    'boolean',
    'custom',
    'date',
    'number',
    'string',
    'unknown',
  ]}
/>

### Methods

<ApiList items={['pipe']} />

### Utils

<ApiList items={['isOfKind', 'isOfType']} />
